Manufacture of cartridge-cases.



A. W. MORRIS.

MANUFACTURE OF CARTRIDGE CASES.

APPHCATION FlLED AUG. I, 1917-.

Patented Sept. 11, 1917.

. q fi c ew Mme V 1 N M l IHl v 0 k AW 1 \x. 1 l F vention being to 1 es AENT Janie.

MANUFACTURE OF CARTRIDGE-CASES.

Specification of Letters Patent.

Patented Sept. 11, 191?.

Application filed August 1, 1917. Serial No. 183,857.

' the length of the side walls, and will also thickness at least as for the base of the cartridge, then pressing materially reduce the amount of equipment necessary for such manufacture. In the accompanying drawing- Figures 1, 2,,3 and 4 are sectional views illustrating successive steps in the formation of a cartridge case 1n accordance with my inventlon.

Ordinarily, cartridge cases of the type to which my invention relates are produced by first providing a disk of metal of a great as that desired this disk into cup form and then by a long continued series of drawingand annealing operations increasing the length and decreasing the thickness of the side walls of the cup until the same are of the desired length and thickness. This method of man'- ufacture is both time consuming and expensive, which objection it is the purpose of my invention to overcome.

In carrying out my invention I first take a tube 1, somewhat in excess of the desired length for the cartridge case but of a thickness substantially such as desired for the side walls of said case, and I then bend inwardly one end of this tube so as to form an inturned flange 2, as shown in Fig. 1. I then place this tube in the female member of a die 3, so that the flange 2 of the tube will project above the into the metal-receiving chamber 4 of the same. Said chamber is then provided with a supplyof molten metal preferably slightly in excess of the amount required to produce cases, it may, as will be evident, be

base of said die and the desired relatively heavy base for the cartridge case, and this metal is then subjected to the action of a ram 6, the treatment being by preference that described in my Letters Patent N 0. 1,222,786, dated April 17 1917, the excess metal extruding between the die and ram in the form of a flash 7,

as shown in Fig. 3.

Not only is the fullamount of metalj'in the head of the cartridge thus insured but the dross and such other impuritles as may be present upon the surface of the mass of molten metal are driven into the flash and afterward cut off and the metallurgical structure of the head is improved to that extent.

When the body of metal 5 becomes set the flanged end 2 of the tube 1 will be firmly embedded therein and, owing to the brazing effect of the heat and pressure, substantially integral therewith, the side walls of the cartridge being as rigid as when formed of an original part of the base of the cartridge.

The cartridge case is finished by trimming off the extruded metal, as shown in Fig. 4, and the sidewalls of the case may be tapered as desired.

Although I have described my invention as applied to the production of cartridge used in the manufacture of other objects in which the same structural conditions are present.

The mode herein described of producing a cartridge case or like structure having relatively thin side walls and a relatively heavy base, said mode consisting in first providing a tube having walls of the thickness desired for those of the case, then placing said tube in a die so that one end of the same projects into the metal-receiving chamber thereof, then introducing into said chamber molten metal in quantity somewhat in excess of that desired for the base of the case, and then subjecting said metal to pressure which will cause the surplus metal to escape from the die in the form of a flash, and then trimming off said flash.

In testimony whereof, I have signed my name to this specification.

I ALBERT w. MORRIS. 

